| STS characteristics | n=13 969 (%) |
| Age (years) | |
| <65 | 5319 (38.08) |
| 65–69 | 2613 (18.71) |
| 70–74 | 2324 (16.64) |
| ≥75 | 3713 (26.58) |
| Diabetes | 5723 (40.97) |
| Control: diet | 883 (6.32) |
| Control: other | 2879 (20.61) |
| Control: insulin | 1961 (14.04) |
| Chronic renal failure | 377 (2.70) |
| Chronic lung disease | 1385 (9.91) |
| Immunocompromise | 502 (3.59) |
| Peripheral arterial disease | 1983 (14.20) |
| Cerebrovascular disease | 2231 (15.97) |
| Prior CVA | 882 (6.31) |
| Prior CABG | 351 (2.51) |
| Prior valve | 72 (0.52%) |
| Previous PCI | 3809 (27.27) |
| MI when ≤24 hours | 480 (3.44) |
| MI when 1–7 days | 2757 (19.74) |
| MI when 7+ days | 3099 (22.18) |
| CHF | 3162 (22.64) |
| NYHA class | |
| No NYHA | 10 102 (72.32) |
| NYHA Stage I | 429 (3.07) |
| NYHA Stage II | 1077 (7.71) |
| NYHA Stage III | 1567 (11.22) |
| NYHA Stage IV | 786 (5.63) |
| Cardiac symptoms at admission | |
| No symptoms or angina | 1883 (14.35) |
| Symptoms unlikely to be ischaemia | 381 (2.90) |
| Angina equivalent | 285 (2.17) |
| Stable angina | 2739 (20.88) |
| Unstable angina | 4420 (33.69) |
| NSTEMI | 2606 (19.86) |
| STEMI | 530 (4.04) |
| Other | 250 (1.91) |
| Cardiac symptoms at surgery | 4774 (17) |
| No symptoms or angina | 831 (17.41) |
| Angina equivalent | 278 (5.82) |
| Stable angina | 555 (11.63) |
| Unstable angina | 1831 (38.35) |
| NSTEMI | 881 (18.45) |
| STEMI | 149 (3.12) |
| Other | 249 (5.22) |
| Cardiac shock | 254 (1.82) |
| Resuscitation yes | 90 (0.64) |
| Atrial fibrillation | 1213 (8.68) |
| Inotropes yes | 182 (1.30) |
| Number of diseased vessels less than 3 | 3713 (26.58) |
| Number of diseased vessels 3 | 10 235 (73.27) |
| Ejection fraction | 4342 (31.08) |
| Endocarditis type active | 25 (0.18) |
| Endocarditis type treated | 31 (0.22) |
| Mitral insufficiency | 1293 (9.26) |
| Mitral stenosis | 155 (1.11) |
| Tricuspid insufficiency | 435 (3.11) |
| Incidence: first surgery | 13 556 (97.04) |
| Incidence: reoperation | 413 (2.96) |
| Status | |
| Elective | 6337 (45.36) |
| Urgent | 7095 (50.79) |
| Emergent | 522 (3.74) |
| Salvage | 14 (0.10) |
| IABP | |
| Preoperative | 910 (6.51) |
| Intraoperative | 269 (1.93) |
| Postoperative | 52 (0.37) |
| Operative death | 259 (1.85) |
BMI, body mass index; CABG, coronary artery bypass grafting; CHF, congestive heart failure; COPD, chronic obstructive pulmonary disease; CVA, cerebrovascular accident; IABP, intra-aortic baloon pump; LVEF, left ventricular ejection fraction; MI, myocardial infarction; NSTEMI, non-ST elevation myocardial infarction; NYHA, New York Heart Association; PCI, percutaneous coronary intervention; STEMI, ST elevation myocardial infarction; STS, Society of Thoracic Surgeons.